As indicated in Fig 2, we assume that there is one quadrilateral element (No. 63) with 4 corner nodes (Q4). After finite element meshing and solution, the nodal coordinates, and displacements for the element No 63 in the global coordinate system are given in Table 1, respectively. Let the material Young's modulus E = 125GPa and Poisson's ratio = 0.25. As shown in Fig 3, using the isoparametric element and 1-node Gaussian quadrature (=0, =0), calculate (hand calculation) (1). The strain {} of the element. (2). The stress {} of the element